Pentax 645D versus Pentax K-1
The Pentax 645D and the Pentax K-1 are two digital cameras that were officially introduced, respectively, in March 2010 and February 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645D) and a full frame sensor. The 645D has a resolution of 39.5 megapixel, whereas the K-1 provides 36.2 MP.
The side-by-side display below illustrates the physical size and weight of the Pentax 645D and the Pentax K-1. Three consecutive perspectives from the front, the top, and the back are presented. All size dimensions are rounded to the nearest millimeter. You can also toggle the display to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left – the 645D – represents 100 percent across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-1 is notably smaller (17 percent) than the Pentax 645D. Moreover, the K-1 is markedly lighter (32 percent) than the 645D. Cameras that are intended for semi-professional or professional use are sometimes a bit bulkier in order to provide them with the necessary ruggedness. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible comparisons there.
|Camera Body Specifications
|Pentax 645D (⇒ rgt)||156 mm||117 mm||119 mm||1480 g||..||YES||2010||9,995||discont.||check|
|Pentax K-1 (⇒ lft)||137 mm||110 mm||86 mm||1010 g||760||YES||2016||1,799||latest||check|
|Leica S Typ 006 (⇒ lft | rgt)||160 mm||120 mm||80 mm||1260 g||..||YES||2012||21,950||discont.||check|
|Nikon D850 (⇒ lft | rgt)||146 mm||124 mm||79 mm||1005 g||1840||YES||2017||3,299||latest||check|
|Nikon D810 (⇒ lft | rgt)||146 mm||123 mm||82 mm||980 g||1200||YES||2014||3,299||discont.||check|
|Nikon D800 (⇒ lft | rgt)||146 mm||123 mm||82 mm||1000 g||..||YES||2012||2,999||discont.||check|
|Nikon D800E (⇒ lft | rgt)||146 mm||123 mm||82 mm||1000 g||..||YES||2012||3,299||discont.||check|
|Nikon D7000 (⇒ lft | rgt)||132 mm||105 mm||77 mm||780 g||1050||YES||2010||1,499||discont.||check|
|Nikon D3S (⇒ lft | rgt)||160 mm||157 mm||88 mm||1240 g||4200||YES||2009||5,199||discont.||check|
|Olympus E-M1 II (⇒ lft | rgt)||134 mm||91 mm||67 mm||574 g||440||YES||2016||1,999||latest||check|
|Panasonic GH5 (⇒ lft | rgt)||139 mm||98 mm||87 mm||725 g||410||YES||2017||1,999||latest||check|
|Pentax K-3 II (⇒ lft | rgt)||131 mm||100 mm||77 mm||800 g||720||YES||2015||1,099||latest||check|
|Pentax 645Z (⇒ lft | rgt)||156 mm||117 mm||123 mm||1550 g||650||YES||2014||8,499||latest||check|
|Sony A99 II (⇒ lft | rgt)||143 mm||104 mm||76 mm||849 g||490||YES||2016||3,199||latest||check|
|Sony A7R II (⇒ lft | rgt)||127 mm||96 mm||60 mm||625 g||290||YES||2015||3,199||discont.||check|
|Sony A7R (⇒ lft | rgt)||127 mm||94 mm||48 mm||465 g||340||YES||2013||2,299||discont.||check|
The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The K-1 was launched at a markedly lower price (by 82 percent) than the 645D, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color depth than smaller pixel-units in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Pentax 645D features a medium format sensor and the Pentax K-1 a full frame sensor. The sensor area in the K-1 is 41 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.0. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the K-1 offers a 3:2 aspect.
With 39.5MP, the 645D offers a higher resolution than the K-1 (36.2MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.88μm for the K-1) due to its larger sensor. However, the K-1 is a somewhat more recent model (by 5 years and 11 months) than the 645D, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the K-1 offers substantially better image quality than the 645D (overall score 14 points higher). The advantage is based on 0.8 bits higher color depth, 2 EV in additional dynamic range, and 1.4 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Pentax 645D (⇒ rgt)||Medium Format||39.5||7264||5440||no||24.6||12.6||1262||82|
|Pentax K-1 (⇒ lft)||Full Frame||36.2||7360||4912||1080/60i||25.4||14.6||3280||96|
|Leica S Typ 006 (⇒ lft | rgt)||Medium Format||37.5||7500||5000||no||23.9||12.2||824||76|
|Nikon D850 (⇒ lft | rgt)||Full Frame||45.4||8256||5504||4K/30p||26.4||14.8||2660||100|
|Nikon D810 (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/60p||25.7||14.8||2853||97|
|Nikon D800 (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/30p||25.3||14.4||2853||95|
|Nikon D800E (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/30p||25.6||14.3||2979||96|
|Nikon D7000 (⇒ lft | rgt)||APS-C||16.1||4928||3264||10800/24p||23.5||13.9||1167||80|
|Nikon D3S (⇒ lft | rgt)||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82|
|Olympus E-M1 II (⇒ lft | rgt)||Four Thirds||20.2||5184||3888||4K/30p||23.7||12.8||1312||80|
|Panasonic GH5 (⇒ lft | rgt)||Four Thirds||20.2||5184||3888||4K/60p||23.9||13.0||807||77|
|Pentax K-3 II (⇒ lft | rgt)||APS-C||24.1||6016||4000||1080/60i||23.6||13.6||1106||80|
|Pentax 645Z (⇒ lft | rgt)||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101|
|Sony A99 II (⇒ lft | rgt)||Full Frame||42.2||7952||5304||4K/30p||25.4||13.4||2317||92|
|Sony A7R II (⇒ lft | rgt)||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|Sony A7R (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
Many modern cameras cannot only take still pictures, but also record videos. The K-1 indeed provides for movie recording, while the 645D does not. The highest resolution format that the K-1 can use is 1080/60i.
Apart from body and sensor, cameras can and do differ across a range of features. The 645D and the K-1 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The adjacent table lists some of the other core features of the Pentax 645D and Pentax K-1 along with similar information for a selection of comparators. If needed, the dpreview camera hub, for example, contains further detail on the cameras' specs.
|Pentax 645D (⇒ rgt)||optical||YES||3.0||921||fixed||no||4000||1.1||no||no|
|Pentax K-1 (⇒ lft)||optical||YES||3.2||1037||full-flex||no||8000||4.4||no||YES|
|Leica S Typ 006 (⇒ lft | rgt)||optical||YES||3.0||922||fixed||no||4000||1.5||no||no|
|Nikon D850 (⇒ lft | rgt)||optical||YES||3.2||2359||tilting||YES||8000||9.0||no||no|
|Nikon D810 (⇒ lft | rgt)||optical||YES||3.2||1229||fixed||no||4000||5.0||12||no|
|Nikon D800 (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||8000||4.0||12||no|
|Nikon D800E (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||8000||4.0||12||no|
|Nikon D7000 (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||8000||6.0||12||no|
|Nikon D3S (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||8000||11.0||no||no|
|Olympus E-M1 II (⇒ lft | rgt)||2360||no||3.0||1037||swivel||YES||8000||18.0||no||YES|
|Panasonic GH5 (⇒ lft | rgt)||3680||no||3.2||1620||swivel||YES||8000||12.0||no||YES|
|Pentax K-3 II (⇒ lft | rgt)||optical||YES||3.2||1037||fixed||no||8000||8.3||no||YES|
|Pentax 645Z (⇒ lft | rgt)||optical||YES||3.2||1037||tilting||no||4000||3.0||no||no|
|Sony A99 II (⇒ lft | rgt)||2400||YES||3.0||1229||tilting||no||8000||12.0||no||YES|
|Sony A7R II (⇒ lft | rgt)||2400||no||3.0||1229||tilting||no||8000||5.0||no||YES|
|Sony A7R (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||4.0||no||no|
The K-1 is a current model that online retailers, such as amazon, will have in stock. In contrast, the 645D has been discontinued (but it can be found pre-owned on ebay). As a replacement in the same line of cameras, the 645D was succeeded by the Pentax 645Z.
So what is the bottom line? Is the Pentax 645D better than the Pentax K-1 or vice versa? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Pentax 645D:
- More heavily discounted: Has been available for much longer (launched in March 2010).
Arguments in favor of the Pentax K-1:
- Better image quality: Scores substantially higher (14 points) in the DXO overall evaluation.
- More dynamic range: Captures a broader range of light and dark details (2 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.4 stops ISO advantage).
- Broader imaging potential: Can capture not only stills but also 1080/60i video.
- Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (1037k vs 921k dots).
- More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
- Faster shutter: Has a higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
- Faster burst: Shoots at higher frequency (4.4 vs 1.1 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (137x110mm vs 156x117mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 470g or 32 percent) and is thus easier to take along.
- Sharper images: Has stabilization technology build-in to reduce the impact of hand-shake.
- More affordable: Was introduced into a lower priced category (82 percent cheaper at launch).
- More modern: Reflects 5 years and 11 months of technical progress since the 645D launch.
If the number of relative strengths (bullet points above) is taken as a guide, the K-1 is the clear winner of the contest (14 : 1 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features.
In any case, while the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the 645D or the K-1 handle or perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable. This is why hands-on reviews by experts are important. The adjacent table relays the overall verdicts of several of the most popular camera review sites. The detailed reviews can be accessed, respectively, on the websites of cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.
|Pentax 645D (⇒ rgt)||-||-||-||4.5/5||-||2010||9,995||discont.||check|
|Pentax K-1 (⇒ lft)||-||84/100 Silver||5/5||4.5/5||5/5||2016||1,799||latest||check|
|Leica S Typ 006 (⇒ lft | rgt)||-||-||-||-||-||2012||21,950||discont.||check|
|Nikon D850 (⇒ lft | rgt)||..||89/100 Gold||4.5/5||..||5/5||2017||3,299||latest||check|
|Nikon D810 (⇒ lft | rgt)||-||86/100 Gold||5/5||4.5/5||4.5/5||2014||3,299||discont.||check|
|Nikon D800 (⇒ lft | rgt)||HiRec||82/100 Gold||5/5||5/5||5/5||2012||2,999||discont.||check|
|Nikon D800E (⇒ lft | rgt)||-||84/100 Gold||5/5||4.5/5||5/5||2012||3,299||discont.||check|
|Nikon D7000 (⇒ lft | rgt)||-||80/100 Silver||4.5/5||5/5||4.5/5||2010||1,499||discont.||check|
|Nikon D3S (⇒ lft | rgt)||-||89/100 Gold||4.5/5||5/5||5/5||2009||5,199||discont.||check|
|Olympus E-M1 II (⇒ lft | rgt)||HiRec||85/100 Gold||4.5/5||5/5||4.5/5||2016||1,999||latest||check|
|Panasonic GH5 (⇒ lft | rgt)||HiRec||85/100 Gold||4.5/5||5/5||5/5||2017||1,999||latest||check|
|Pentax K-3 II (⇒ lft | rgt)||-||-||5/5||4.5/5||5/5||2015||1,099||latest||check|
|Pentax 645Z (⇒ lft | rgt)||-||-||4.5/5||5/5||5/5||2014||8,499||latest||check|
|Sony A99 II (⇒ lft | rgt)||-||85/100 Silver||4.5/5||4.5/5||4.5/5||2016||3,199||latest||check|
|Sony A7R II (⇒ lft | rgt)||HiRec||90/100 Gold||5/5||4.5/5||5/5||2015||3,199||discont.||check|
|Sony A7R (⇒ lft | rgt)||HiRec||82/100 Gold||4.5/5||5/5||5/5||2013||2,299||discont.||check|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when refering to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
If you would like to see a different side-by-side camera review, just make your choice using the following search menu. An an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool. If you do not see the camera that you are looking for, kindly get in touch, and I will try to add information on that model to the database.
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